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True/false. Density
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- 3367 visitas
Are the sentences true or false? An object that occupies 2805 mm3 and has a mass of 1.3 g floats on water. Density is calculated using the mass and the temperature of a body. A substance floats when it…
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Complete. Adaptation of reptiles
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Complete the text with the missing words: embryo - adaptations – scales – waterproof The main of reptiles to living on land are: Their bodies are . They have dry, hard that prevent water loss.…
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Choose. Changes in matter
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Choose what type of change is taking place in each of these situations: A fire becomes smoke and then ash. A block of ice melts. An iron object let out in the weather develops a layer of rust. A piece…
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Think about it. The natural environment
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- 3208 visitas
Remember what you have studied in this section and answer the questions: Why does water exist in a liquid state on Earth but not on other planets? What functions does water have for living things?…
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Complete. Heat and changes of state
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Complete the following sentences with the missing words: When we put liquid water in the freezer, first it goes cold and later it . Liquids at any temperature change to water vapour because of . The…
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Match each feature of weather to one or more of the descriptions
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Match each feature of weather to one or more of the descriptions: The water that falls from the clouds to the Earth. → It tells us how hot or cold the air is. → The movement of air. → …
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Interpret. Molecules and crystals
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Look at the pictures and answer the questions: In what way is a sulphur molecule different from a water molecule? In a glass of water, what is the proportion of hydrogen atoms to oxygen atoms? Describe…
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Complete. Plant nutrition
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- 2820 visitas
Copy and complete the sentences: roots chlorophyll carbon phloem carbon dioxide elaborated sap water oxygen xylem Photosynthesis is the process that allows plants to make food from , and . The sunlight…
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Think about it. Effects of heat on bodies
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- 2709 visitas
Remember what you have studied in this section and answer the questions: Icebergs are large masses of frozen water. Why do they float on top of sea water? Explain how a hot air balloon works. Why does…
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Initial evaluation 1 - The Earth, a Living Planet
EduBook Organización
- 2618 visitas
Are the following sentences true or false? Life on Earth first appeared on land. The bodies of all living things contain water. Water helps humans maintain a constant body temperature. The chemical…
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